This list was taken from, here - http://www.comicbookherald.com/the-complete-marvel-reading-order-guide/dark-reign-reading-order-list/


    Secret Invasion: Dark Reign #1 (One Shot)
    New Avengers #48
    Thunderbolts #126-127
    Invincible Iron Man #8
    Avengers: The Initiative #20
    Avengers: The Initiative #21-23
    Secret Invasion: Requiem #1 (One Shot)
    New Avengers #049
    Dark Reign Files #1 (One Shot)
    Dark Avengers #1
    Dark Reign: Young Avengers #1-2
    Wolverine Origins #33-36
    Thunderbolts #128-129
    Deadpool #6-7
    Avengers: The Initiative #24
    Deadpool #8
    Thunderbolts #130
    Deadpool #9
    Thunderbolts #131
    Dark Avengers #2-4
    Dark Reign: Young Avengers #3-5
    Dark Reign: Fantastic Four #1-5
    Dark Wolverine #75-#77
    Ms. Marvel #35-46
    Dark Reign: Elektra #1-5
    Spider-Woman #1-7
    Captain America #49-50
    Dark Reign: New Nation #1 (One Shot)
    The Skrull Kill Krew #1-5
    New Avengers: The Reunion #1-4
    Secret Warriors #1-6
    Agents of Atlas #1-8
    Black Panther #1-6
    Dark Reign: The Hood #1-5
    Dark Reign: Mr. Negative #1-3
    The Punisher #1-6
    Dark Reign: Zodiac #1-3
    Savage She-Hulk #1-4
    SWORD #1-5
    Vengeance of The Moon Knight #1-5
    War Machine #1-6
    The Mighty Avengers #21-23
    Incredible Hercules #127-128
    MODOK Reign Delay #1 (One Shot)
    Dark Reign: The Goblin Legacy #1 (One Shot)
    Dark Reign: Made Men #1 (One Shot)
    Dark Reign: The Cabal #1 (One Shot)
    Thor #600-603
    Mighty Avengers #24-26
    New Avengers #50-54
    Dark Avengers #5-6
    Captain America #600
    Amazing Spider-Man #595-599
    Dark Reign: The Sinister Spider-Man #1-4
    Dark Reign: Hawkeye #1-5
    Dark Reign: Lethal Legion #1-3
    Dark Wolverine #78-80
    Invincible Iron Man #9-11
    War Machine #6-10
    Avengers: The Initiative #25
    War Machine #11-12
    Invincible Iron Man #12-13
    Avengers: The Initiative #26-27
    Avengers: The Initiative #27
    Deadpool #10-12
    New Avengers #55-58
    Mighty Avengers #32-33
    Uncanny X-Men Annual #2
    Dark X-men: The Beginning #1-3
    X-Men Legacy #226-227
    Dark Avengers X-Men Utopia #1
    Uncanny X-Men #513
    Dark Avengers #7
    Uncanny X-Men #514
    Dark Avengers #8
    Dark Avengers X-Men Exodus #1
    Dark X-Men: The Confession #1
    Dark Reign The List: X-Men #1
    Dark X-Men #1-5
    Planet Skaar Prologue #1
    Skaar Son of Hulk #11-12 (Skaar vs. Hulk.)
    Hulk #13
    Incredible Hulk #601-603
    Dark Reign The List: Hulk #1
    Incredible Hulk #604-605
    Avengers: The Initiative #28-30
    New Avengers #59-60
    Dark Reign The List: Avengers #1
    New Avengers Annual #3
    Mighty Avengers #34
    Dark Reign The List: Daredevil #1
    Dark Wolverine #81
    Dark Reign The List Wolverine #1
    Dark Avengers Annual #1
    Thunderbolts #132-134
    Secret Warriors #7
    Thunderbolts #135
    Secret Warriors #8
    Thunderbolts #136
    Secret Warriors #9
    Dark Reign: Ares #1-3
    Dark Reign The List: Secret Warriors #1
    Secret Warriors #10
    Invincible Iron Man #14-17
    Thunderbolts #137
    Dark Reign The List: Punisher #1
    Dark Reign The List: Spider-Man #1
    Invincible Iron Man #18-19
    Dark Avengers 9-12
    Avengers: The Initiative #31
    Thunderbolts #138-140
    Captain America Reborn #1-6
    Invincible Iron Man #20-24
    Thor Giant-Size Finale #1 (One Shot)
    Thor #604-606
    Captain America: Who Will Wield The Shield?